Testing device



LHEJMA-TEIER AND c.1. ALLCUIT.

' TEST ING DEVICE. APPLlCATlbN FILED SEPT-1, I917- Patented ,DeeQ27, 1921.

/ ATTORNEY- UNETED ra -res.

PATENT OFFICE.

JESSE E. MATEER an]: CHESTER rjamcurr, or w nxmsemae', riimrsynvsme, ASSIGNORS TO WESTINGHOUSE ELECTRIC & MANUFACTURING company, A

CORPORATION OF PENNSYLVANIA,

rns'rme Dev-Ion.

To all whom it may concern: 7 Y

Be it known that we, JEssE MATEEI a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and Stateof Pennsylvania, and CHESTER T. ALLoU'rr, a citizen ofthe United States, and a resident of Wilkinsburg, in-

7 and particularly to such devices as are used for testing the insulating properties of oils and other fluidsp v v One object of our invention is to provide a simple and inexpensive device of the above indicated character that may be readily cleaned and that shall permit the ready removal of the electrodes forming a part thereof for the urpose'of removing irregularities in the aces of the electrodes that may occur duringthefoperation of the de- Another object of our invention is to provide electrodes that are adapted to slide longitudinally through the walls of a receptacle and that may be locked in position and-prevented from turning about their axes when the leads to the operating circuit are being attached thereto. 7

In practising our invention, we provide an elongated receptacle of insulating material having an aperture of cup shape in its upper side for the receptionof a fluid, the dielectric strength of which is to be tested. Cylindrical electrodes extend through the end walls of the receptacle, from the outside thereof, to positions in the lower central portion of the cup, at which position, the end faces of the electrodes are spaced a sufiicient distance to permit .a voltage-. break-down test of the fluid. We provide packing in the walls of the receptacle, sur

rounding the electrodes, to prevent leakage of the fluid and to cooperate with glands to rigidly hold the electrodes in adjusted position. The packing also cooperates with knurled or milled portions of the electrode surfaces to prevent turning of the electrodes and consequent alteration of the adjusted positions of the same when they are being connected to the leads of the supply circuit.

Figure 1, of the accompanying drawings,

Application filed September 1, 1917. SerialNo. 189,349.

Specification of Lttersltatexit'. Patnlte diDec. 1921.-

is a longitudinal sectionalviewef a testing device, embodylng our invention, and Fig. 2"

is a top plan. view :of the; testingldevice shown inFig. 1. Abody-"Inember is provided .in itsuppens'idq. with a well 2 of substantially cup-shape; Interiorly threadedring bushings 5,:havingouter peripheral'fianges 6, are'embedded in: relatively thick end walls 4, of the body mem-. her 1 and flush with the outer facesthereof and are adapted to receive threaded glands 7.1 Theglands 7 have knurled adjustin heads 8 and are adapted to loosely-surroun 1, of-insulating material the cylindrical electrodes '9 that extend I through the walls 4: from the lower central portlon of the well to positions-outside the same where they :are' provided with terminals 10L The-terminals101are provided with which comprises an elongated shank 13 that is adapted .forfuse as agap-spacinggage and 1s? of a dlameter equal to *the desired binder-screws '11 and L12 the formerv of- V length of gap; Annular. grooves' 14 are'pro-f vided inthe walls 4, adjacent the ringbushings 5, for thereception of packing material 15 that is adapted to cotiperate with the walls 4, the glands 7 and knurled or milled portions 16 of the electrode surfaces, to prevent leakage of the fluid from the cup, to lock the electrodes in adjusted osition and to prevent turning of the electro es during the time of connecting the supply-circuit leads to the terminals of the electrodes.

Previous to operation, the device may be adjusted by removing the binding screw 11 and inserting the shank 13 between the adj acent faces of the electrodes. When the glands 7 are advanced outwardly, the electrodes 9 may be so adjusted longitudinally that they maybe spaced apart a distance equal to the diameter of the shank 13. When the distance between the faces'of the electrodes has thus been determined, theglands7 are advanced into the bushings 5, to lock the electrodes in position. The packing 15 intimately engages the grooves 14 in the walls 4, and the milled portion 16 of the electrodes and thereby prevents turning of the latter and provides fluid-tight joints at the apertures in the walls 1 in which the electrodes are inserted.

A fluid to be tested isplaced in the cup to a depth sufficient to cover the electrodes,

' tiomwith a'-fluid*receptacle, or longitudiand the terminals 10 are connected toa seit able circuit rtnot, shown). The fluid may.

then he submitted to a: vantage-breakdown test across'the gap. 7

While We have shown and described the preferred embodimentof our inventien git is to he understood that changes may be efe i'ected-therein thatwill not depart from the a spirit and "scope'ofthe'same, as set forth in the appended claims.

We claim as our invention :v 1.111 a 'fluidetestingdevieythe combinanally Islidable cylindrical electrodes that extend through the Walls of the re'ceptacl'e and each of which fig t provided with a milled port-ion intermediate its-ends,;packing that embraces each electrode at -the said milled portion'thereofiand ineans'for causing the eoaction' of theipackingwith' the milled portion and the receptacleivall to prevent turningof the electrode. 7 i .2 2. In a fiuid testi-ng l device, the combination with: a fiuid receptacle having cylindrical openings --throu h the Walls thereof; of longitudinally slida' 1e i and adj ustahle i electrodes fitting said openings, packing" means for the electro'des andmeans on the elec trodescooperating with 1 the packing means for preventing the turning of 'the' electrodes and locking the same in adjusted gposition's.

In :a fluid-testing? device, -the'-.con1binationwitha fluid receptacle,havingan open-v the'rwalls of which constitute a relatively larges'smooth bearing pertiom of a longir e-onset? v tnolinally slidable electrode conforming to,

and snugly fitting said opening towpermit of ready insertion and withdrawal through,

"and adjustment in,1the opening,.'and anaemher cooperating between s'aid'electrode and :saidreeeptacle for relatively-quickly securing said electrode in position.

4;...A fluid-testing device comprising electiw'ide's and a single means "cooperating with one of the-electrodes to constitute a terminal therefor and having a gap-adjust ing portion for insertion between the electrodes.

5. A fluid-testing device comprising :ahollow integral block oi insulating material havinghearin openings through the Walls thereof, -l'ongitudinally-slidable and adjustable electrodes extending through said openings and means-whereby aid electrodes-may besecured'in position and the escape ofa fluid-through said openings prevented.

6. A portable fluids-testing device com subscribed ournames this 23rd-da-y of;-Au-

gust, 1917. c A c, h

CHESTER T. ALLCUTT. 

